linux-kernel - Re: [PATCH][V2] backlight: sky81452: insure while loop does not allow negative array indexing

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Message-ID: <20200228164553.eojh3hbrymq3tw2d@holly.lan>
Date:   Fri, 28 Feb 2020 16:45:53 +0000
From:   Daniel Thompson <daniel.thompson@...aro.org>
To:     Colin Ian King <colin.king@...onical.com>
Cc:     Lee Jones <lee.jones@...aro.org>,
        Jingoo Han <jingoohan1@...il.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Gyungoh Yoo <jack.yoo@...worksinc.com>,
        Bryan Wu <cooloney@...il.com>, dri-devel@...ts.freedesktop.org,
        linux-fbdev@...r.kernel.org, kernel-janitors@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH][V2] backlight: sky81452: insure while loop does not
 allow negative array indexing

On Thu, Feb 27, 2020 at 03:10:43PM +0000, Colin Ian King wrote:
> On 27/02/2020 11:46, Daniel Thompson wrote:
> > On Wed, Feb 26, 2020 at 07:58:26PM +0000, Colin King wrote:
> >> From: Colin Ian King <colin.king@...onical.com>
> >>
> >> In the unlikely event that num_entry is zero, the while loop
> >> pre-decrements num_entry to cause negative array indexing into the
> >> array sources. Fix this by iterating only if num_entry >= 0.
> >>
> >> Addresses-Coverity: ("Out-of-bounds read")
> >> Fixes: f705806c9f35 ("backlight: Add support Skyworks SKY81452 backlight driver")
> >> Signed-off-by: Colin Ian King <colin.king@...onical.com>
> >> ---
> >>
> >> V2: fix typo in commit subject line
> > 
> > Isn't the correct spelling "ensure"?
> 
> It is. V1 is correct after all. Doh.

It wasn't spelt "ensure" in v1... 


Daniel.